Jurors failed to reach a verdict during the first day of deliberations in the capital murder case of accused cop-killer Ronell Wilson yesterday.

Wilson, 24, is accused of shooting two undercover detectives, James Nemorin and Rodney Andrews, at point-blank range during a botched gun deal on Staten Island in 2003.

“I don’t have any doubt they’ll have a conviction,” said Rodney Andrews Sr., who sat alongside his son’s widow and members of Nemorin’s family in the Brooklyn federal courtroom yesterday.

The jury wanted a second look at the testimony of cooperating witness Mitchell Diaz, who testified about discussions that took place on the day of the murders.

Diaz told jurors that at some point during the day, Wilson and his fellow gang-bangers decided that instead of selling a gun to Nemorin, they were going to rob the cop of the $1,200 they knew he’d be carrying.